Transport criticality of the first-order Mott transition in a quasi-two-dimensional organic conductor, $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl

Details Transport criticality of the first-order Mott transition in a quasi-two-dimensional organic conductor, $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl Transport criticality of the first-order Mott transition in a quasi-two-dimensional organic conductor, $κ$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl

2003-07-13

arxiv.org/abs/cond-mat/0307304v2

Phys. Rev. B, 69, 064511 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.69.064511

An organic Mott insulator, $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl, was investigated by resistance measurements under continuously controllable He gas pressure. The first-order Mott transition was demonstrated by observation of clear jump in the resistance variation against pressure. Its critical endpoint at 38 K is featured by vanishing of the resistive jump and critical divergence in pressure derivative of resistance, $|\frac{1}{R}\frac{\partial R}{\partial P}|$, which are consistent with the prediction of the dynamical mean field theory and have phenomenological correspondence with the liquid-gas transition. The present results provide the experimental basis for physics of the Mott transition criticality.

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